﻿/* ManagedZFS (mzfs) - A Managed Implementation of the ZFS Filesystem.
Copyright (c) 2012, William 'cathode' Shelley
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER INCONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace ManagedZFS
{
    /// <summary>
    /// Represents a ZFS Block Pointer. From the ZFS spec: "Data is transferred
    /// between disk and main memory in units called blocks. A block pointer
    /// (blkptr_t) is a 128 byte ZFS structure used to physically locate,
    /// verify, and describe blocks of data on disk."
    /// </summary>
    [StructLayout(LayoutKind.Explicit)]
    public unsafe struct BlockPointer
    {
        #region Fields
        [FieldOffset(0)]
        private fixed byte data[128];

        [FieldOffset(4)]
        private int vdev1;
        [FieldOffset(20)]
        private int vdev2;
        [FieldOffset(36)]
        private int vdev3;
        #endregion
        #region Properties
        //public ulong Checksum0 { get; set; }
        //public ulong Checksum1 { get; set; }
        //public ulong Checksum2 { get; set; }
        //public ulong Checksum3 { get; set; }
        #endregion
    }
}
